Filling for man holes



(No Model.)

J. PLANNBRY. FILLING FOR MAN HOLES.

Patented Jan. 28, 1890.

W15 nesse@ UNITED STATES PATENT OFFICE.

JOSEPHFLANNERY, OF NEW YORK, N. Y.

FILLING FOR MAN-HOLES.

SPECIFICATION forming part 0f Letters Patent NO. 420,192, dated January 20, 1890. Application led May 9, 1389. Serial No. 310,085. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH FLANNERY, of New York, in the county and State of New York, have invented a certain new and useful Improvement in Fillings for Man-Holes for Underground Subways and Similar Structures, of which the following is a specification.

Heretofore the construction of underground subways or similar structures has resulted in the accumulation of dangerous and explosive gases therein, from which violent explosions have resulted, endangering life and causing loss of property.

It is the object of my improvement to prevent the accumulation of gas in such manholes.

In the accompanying drawings; Figure l is a sectional elevation of a man-hole for an underground subway or similar structure, together with a filling or plug embodying my improvement and a portion of a subway. Fig. 2 is a view of a certain kind of plug which I employ in connection therewith. Fig. 3 is a view of a plug of modied form. Fig. 4 is a detail view of one of the sections of the latter.

Similar letters of reference designate corresponding parts in all the iigures.

In the example of my improvement shown in Figs. l and 2, A designates a man-hole covered with a man-hole plate B at its outer end in any well-known manner.

O designates an underground subway or similar structure.

D designates a plug,which when the subway is not to be reached through the man-hole is inserted in the man-hole and operates to substantially prevent the introduction of gas from the subway or similar structure into the man-hole.

In this example of my improvement the plug comprises an elongated and, as here shown, a cylindrical bag or casing d, which may be made of canvas, netting, or any suitable material which is yielding. The bag or casin g d is filled with anylight,loose, and yielding material-suck for instance, as mineral wool, hay, or a granulated or comminuted material. The diameter of the plug D is such that when inserted in the man-hole it will iit substantially snug within the same. When the-plug is introduced into the manhole, it occupies preferably the whole of the space within the man-hole, andwhen arranged therein will prevent the accumulation of a quantity of gas in the manhole,which might result in an explosion. The plug being filled with loose light material is easily withdrawn and inserted, and for the purpose of facilitating its withdrawal I have shown at its upper end a handle E, which when the man-hole cover has been removed may be grasped to withdraw the plug.

In Figs. 3 and l I have shown a modification of the plug, consisting in forming the same in sections J, which may be separately inserted in the man-hole and removed therefrom. When inserted, the sections will be superposed one upon another. sections may be provided with a separate handle E, by which it may be removed from the man-hole.

lVith certain kinds of light loose material the bag or casing d may be omitted and the material may be inserted and removed in a loose and unconned state.

lVhat I claim as my invention, and desire to secure by Letters Patent, is-g 1. Aplug or filling for a man-holo for a subway or similar structure, consisting of light loose material adapted to be inserted into and removed from the man-hole, substantially as and for the purpose specified.

2. Aplug or filling for a man-hole for a subway or similar structure, consisting of a bag or casing iilled with a light loose material and adapted to tit snugly within the man-hole, substantially as and for the purpose specified.

JOSEPH FLANNERY.

lVitnesses: Y

W. P. ELLIOTT, Jos. D. HUNTINGTON.

Each of the 

